3PXT

Crystal Structure of Ferrous CO Adduct of MauG in Complex with Pre-Methylamine Dehydrogenase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.16 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.177 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal Structures of CO and NO Adducts of MauG in Complex with Pre-Methylamine Dehydrogenase: Implications for the Mechanism of Dioxygen Activation.

Yukl, E.T.Goblirsch, B.R.Davidson, V.L.Wilmot, C.M.

(2011) Biochemistry 50: 2931-2938

  • DOI: 10.1021/bi200023n
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • MauG is a diheme enzyme responsible for the post-translational formation of the catalytic tryptophan tryptophylquinone (TTQ) cofactor in methylamine dehydrogenase (MADH). MauG can utilize hydrogen peroxide, or molecular oxygen and reducing equivalent ...

    MauG is a diheme enzyme responsible for the post-translational formation of the catalytic tryptophan tryptophylquinone (TTQ) cofactor in methylamine dehydrogenase (MADH). MauG can utilize hydrogen peroxide, or molecular oxygen and reducing equivalents, to complete this reaction via a catalytic bis-Fe(IV) intermediate. Crystal structures of diferrous, Fe(II)-CO, and Fe(II)-NO forms of MauG in complex with its preMADH substrate have been determined and compared to one another as well as to the structure of the resting diferric MauG-preMADH complex. CO and NO each bind exclusively to the 5-coordinate high-spin heme with no change in ligation of the 6-coordinate low-spin heme. These structures reveal likely roles for amino acid residues in the distal pocket of the high-spin heme in oxygen binding and activation. Glu113 is implicated in the protonation of heme-bound diatomic oxygen intermediates in promoting cleavage of the O-O bond. Pro107 is shown to change conformation on the binding of each ligand and may play a steric role in oxygen activation by positioning the distal oxygen near Glu113. Gln103 is in a position to provide a hydrogen bond to the Fe(IV)═O moiety that may account for the unusual stability of this species in MauG.


    Organizational Affiliation

    Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, 321 Church Street SE, Minneapolis, Minnesota 55455, United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Methylamine utilization protein MauG
A, B
373Paracoccus denitrificans (strain Pd 1222)Mutation(s): 0 
Gene Names: mauG
EC: 1.-.-.-
Find proteins for Q51658 (Paracoccus denitrificans (strain Pd 1222))
Go to UniProtKB:  Q51658
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Methylamine dehydrogenase light chain
C, E
137Paracoccus denitrificansMutation(s): 0 
Gene Names: mauA
EC: 1.4.9.1
Find proteins for P22619 (Paracoccus denitrificans)
Go to UniProtKB:  P22619
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Methylamine dehydrogenase heavy chain
D, F
386Paracoccus denitrificans (strain Pd 1222)Mutation(s): 0 
EC: 1.4.9.1
Find proteins for A1BB97 (Paracoccus denitrificans (strain Pd 1222))
Go to UniProtKB:  A1BB97
Small Molecules
Ligands 6 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

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A, B
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
ACT
Query on ACT

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C, D, F
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
CA
Query on CA

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A, B
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
HEC
Query on HEC

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A, B
HEME C
C34 H34 Fe N4 O4
HXQIYSLZKNYNMH-LJNAALQVSA-N
 Ligand Interaction
PG6
Query on PG6

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F
1-(2-METHOXY-ETHOXY)-2-{2-[2-(2-METHOXY-ETHOXY]-ETHOXY}-ETHANE
C12 H26 O6
DMDPGPKXQDIQQG-UHFFFAOYSA-N
 Ligand Interaction
CMO
Query on CMO

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A, B
CARBON MONOXIDE
C O
UGFAIRIUMAVXCW-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
0AF
Query on 0AF
C, E
L-PEPTIDE LINKINGC11 H12 N2 O3TRP
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.16 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.177 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 55.530α = 109.94
b = 83.520β = 91.54
c = 107.780γ = 105.78
Software Package:
Software NamePurpose
Blu-Icedata collection
REFMACphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-03-23
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2018-01-24
    Type: Structure summary